Matlab functions..

bar, barh

Bar chart

Syntax

• bar(Y)
  bar(x,Y)
  bar(...,width)
  bar(...,'style')
  bar(...,LineSpec)
  h = bar(...)
  
  barh(...)
  h = barh(...)
  

Description

A bar chart displays the values in a vector or matrix as horizontal or vertical bars.

bar(Y) draws one bar for each element in Y. If Y is a matrix, bar groups the bars produced by the elements in each row. The x-axis scale ranges from 1 to length(Y) when Y is a vector, and 1 to size(Y,1), which is the number of rows, when Y is a matrix.

bar(x,Y) draws a bar for each element in Y at locations specified in x, where x is a monotonically increasing vector defining the x-axis intervals for the vertical bars. If Y is a matrix, bar clusters the elements in the same row in Y at locations corresponding to an element in x.

bar(...,width) sets the relative bar width and controls the separation of bars within a group. The default width is 0.8, so if you do not specify x, the bars within a group have a slight separation. If width is 1, the bars within a group touch one another.

bar(...,'style') specifies the style of the bars. 'style' is 'grouped' or 'stacked'. 'group' is the default mode of display.

• 'grouped' displays n groups of m vertical bars, where n is the number of rows and m is the number of columns in Y. The group contains one bar per column in Y.
• 'stacked' displays one bar for each row in Y. The bar height is the sum of the elements in the row. Each bar is multi-colored, with colors corresponding to distinct elements and showing the relative contribution each row element makes to the total sum.

bar(...,LineSpec) displays all bars using the color specified by LineSpec.

h = bar(...) returns a vector of handles to patch graphics objects. bar creates one patch graphics object per column in Y.

barh(...), and h = barh(...) create horizontal bars. Y determines the bar length. The vector x is a monotonic vector defining the y-axis intervals for horizontal bars.

Examples

Plot a bell shaped curve:

• x = -2.9:0.2:2.9;
  bar(x,exp(-x.*x))
  colormap hsv
  
  
  
  

Create four subplots showing the effects of various bar arguments:

• Y = round(rand(5,3)*10);
  subplot(2,2,1)
  bar(Y,'group')
  title 'Group'
  

• subplot(2,2,2)
  bar(Y,'stack')
  title 'Stack'
  

• subplot(2,2,3)
  barh(Y,'stack')
  title 'Stack'
  

• subplot(2,2,4)
  bar(Y,1.5)
  title 'Width = 1.5'
  

bar3, bar3h

Three-dimensional bar chart

Syntax

• bar3(Y)
  bar3(x,Y)
  bar3(...,width)
  bar3(...,'style')
  bar3(...,LineSpec)
  h = bar3(...)
  
  bar3h(...)
  h = bar3h(...)
  

Description

bar3 and bar3h draw three-dimensional vertical and horizontal bar charts.

bar3(Y) draws a three-dimensional bar chart, where each element in Y corresponds to one bar. When Y is a vector, the x-axis scale ranges from 1 to length(Y). When Y is a matrix, the x-axis scale ranges from 1 to size(Y,2), which is the number of columns, and the elements in each row are grouped together.

bar3(x,Y) draws a bar chart of the elements in Y at the locations specified in x, where x is a monotonic vector defining the y-axis intervals for vertical bars. If Y is a matrix, bar3 clusters elements from the same row in Y at locations corresponding to an element in x. Values of elements in each row are grouped together.

bar3(...,width) sets the width of the bars and controls the separation of bars within a group. The default width is 0.8, so if you do not specify x, bars within a group have a slight separation. If width is 1, the bars within a group touch one another.

bar3(...,'style') specifies the style of the bars. 'style' is 'detached', 'grouped', or 'stacked'. 'detached' is the default mode of display.

• 'detached' displays the elements of each row in Y as separate blocks behind one another in the x direction.
• 'grouped' displays n groups of m vertical bars, where n is the number of rows and m is the number of columns in Y. The group contains one bar per column in Y.
• 'stacked' displays one bar for each row in Y. The bar height is the sum of the elements in the row. Each bar is multi-colored, with colors corresponding to distinct elements and showing the relative contribution each row element makes to the total sum.

bar3(...,LineSpec) displays all bars using the color specified by LineSpec.

h = bar3(...) returns a vector of handles to patch graphics objects. bar3 creates one patch object per column in Y.

bar3h(...) and h = bar3h(...) create horizontal bars. Y determines the bar length. The vector x is a monotonic vector defining the y-axis intervals for horizontal bars.

Examples

This example creates six subplots showing the effects of different arguments for bar3. The data Y is a seven-by-three matrix generated using the cool colormap:

• Y = cool(7);
  subplot(3,2,1)
  bar3(Y,'detached')
  title('Detached')
  

• subplot(3,2,2)
  bar3(Y,0.25,'detached')
  title('Width = 0.25')
  

• subplot(3,2,3)
  bar3(Y,'grouped')
  title('Grouped')
  

• subplot(3,2,4)
  bar3(Y,0.5,'grouped')
  title('Width = 0.5')
  

• subplot(3,2,5)
  bar3(Y,'stacked')
  title('Stacked')
  

• subplot(3,2,6)
  bar3(Y,0.3,'stacked')
  title('Width = 0.3')
  

• colormap([1 0 0;0 1 0;0 0 1])